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Related-Party Disclosures - Schedule of Subsidiaries (Detail) - Subsidiaries [member] | 12 Months Ended
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Dec. 31, 2018
3221969 Nova Scotia Company [member] | Nova Scotia, Canada [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | Nova Scotia, Canada
International Insurance Group Inc. [member] | Barbados [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | Barbados
Mustang Acquisition Holdings Inc. [member] | Delaware, United States [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | Delaware, United States
MWH International Inc. [member] | Delaware, United States [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | Delaware, United States
Stantec Australia Pty Ltd [member] | Australia [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | Australia
Stantec Consulting Caribbean Ltd. [member] | Barbados [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | Barbados
Stantec Consulting International LLC [member] | Arizona, United States [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | Arizona, United States
Stantec Consulting International Ltd. [member] | Canada [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | Canada
Stantec Consulting Ltd./Stantec Experts-conseils ltee [member] | Canada [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | Canada
Stantec Consulting Michigan Inc. [member] | Michigan, United States [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | Michigan, United States
Stantec Consulting Services Inc. [member] | New York, United States [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | New York, United States
Stantec Delaware II LLC [member] | Delaware, United States [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | Delaware, United States
Stantec Holdings (2017) Limited [member] | United Kingdom [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | United Kingdom
Stantec Holdings II Ltd. [member] | Alberta, Canada [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | Alberta, Canada
Stantec New Zealand [member] | New Zealand [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | New Zealand
Stantec Technology International Inc. [member] | Delaware, United States [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | Delaware, United States
Stantec UK Limited. [member] | United Kingdom [member] |
Disclosure of subsidiaries [line items] |
Jurisdiction of Incorporation | United Kingdom

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- Definition The country in which a subsidiary of the entity is incorporated. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 16 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_16_b_ii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 17 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_17_b_ii&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 12 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_12_b&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 19B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_19B_b&doctype=Standard -URIDate 2018-03-16 + Details
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